2. Installation Guidelines2.3.4 Cleaning the lensTo minimize the possibility of damaging the optical coating or scratching exposed lens surface, we have de-veloped recommendations for cleaning the lens. FIRST, we recommend you try to remove any material fromthe lens by blowing it off with clean, dry deionized air. DO NOT use any liquid to clean the lenses.Necessary toolsToraysee TM cloth (delivered together with the lens kit). Order number : R379058.How to clean the lens ?Proceed as follow :1. Always wipe lenses with a CLEAN Toraysee TM cloth.2. Always wipe lenses in a single direction.Warning: Do not wipe back and forwards across the lens surface as this tends to grind dirt into the coating.3. Do not leave cleaning cloth in either an open room or lab coat pocket, as doing so can contaminate the cloth.4. If smears occur when cleaning lenses, replace the cloth. Smears are the first indication of a dirty cloth.Do not use fabric softener when washing the cleaning cloth or softener sheets when drying the cloth.Do not use liquid cleaners on the cloth as doing so will contaminate the cloth.Other lenses can also be cleaned safely with this Toraysee TM cloth.2.4 BatteriesOverview• Battery installation2.4.1 Battery installationHow to install the batteryTwo batteries are packed together with the RCU. Before using your RCU, install first these batteries.1. Remove the battery cover on the backside by pushing the handle a little towards the bottom of the RCU.2. Lift up the top side of the cover at the same time.3. Insert the batteries as indicated in the RCU.4. Put the battery cover on its place.12 R5976420 BARCOREALITY SIM 6 ULTRA 14052003